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प्रश्न
Comment on the role of placenta as an endocrine gland.
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उत्तर
Placenta acts as an endocrine gland and produces the human chorionic gonadotropins, human placental lactogen, oestrogen, progesterone and relaxin (later stages of pregnancy). These hormones support foetal growth and help in the maintenance of pregnancy. Hormones like oestrogen, progestogen, cortisol and prolactin are increased several folds in the maternal blood.
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संबंधित प्रश्न
During the reproductive cycle of a human female, when, where and how does a placenta develop? What is the function of placenta during pregnancy and embryo development?
Eye lens is formed from ______.
Which of the following is not a function of the placenta?
Read the following and answer from given below:
Cleavage is the series of rapid mitotic divisions in the zygote and forms blastula. The 2, 4, 8, 16 daughter cells are called blastomeres. An embryo with 64 blastomeres is known as a blastocyst and has a blastocoel cavity. Blastocyst gets implanted in the uterine wall and leads to preganancy.
The solid mass of cells with 16 blastomeres is called ______
The secondary sexual characters develop in females because:
Several hormones like HCG, HPL estrogen, and progesterone are produced by ______.
Explain the formation of placenta after the implantation in a human female.
Name the type of antibody that can be transferred through the placenta.
The diagram given below represents a specific stage of human embryonic development. Identify the stage.
The diagram given below shows the early embryonic stages of fish, reptiles, birds and humans. Though adult reptiles, birds and mammals breathe air, their embryos possess gills. How does this fact support evolution?
